[time-nuts] Fwd: HP10811 Oscillator Thermal Fuse
ewkehren at AOL.com
Thu May 11 10:43:54 EDT 2017
Having had a fan failure on a well insulated Rb we use a temperature sensor also used for compensation in to a PIC to shut down the systemBert Kehren
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-------- Original message --------From: "David G. McGaw" <david.g.mcgaw at dartmouth.edu> Date: 5/10/17 11:20 PM (GMT-05:00) To: Discussion of precise time and frequency measurement <time-nuts at febo.com> Subject: Re: [time-nuts] Fwd: HP10811 Oscillator Thermal Fuse
I too have had a fuse open up due to a failed thermistor in a HP10811.
On 5/10/17 7:43 PM, Dan Rae wrote:
> As I reported the last time this subject came up, or maybe the time
> before, the only time I had an open thermal fuse was in a 10811 that
> had an open thermistor. I was able to replace that and get the OCXO
> working, but if the fuse had been replaced with a wire link I'm sure
> the entire oven would have been toast.
> There have been two types of fuse fitted, all I those have are the
> type that can be fitted with the plug in axial panasonic type, less
> than a dollar from Digikey. The older ovens had a different type but
> I imagine it's similarly easy to replace.
> All my 10811s have the higher temperature Panasonic fuse fitted and I
> sleep well at night...
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